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  • 6.0l fuel press

    Sorry long question- I know fuel press is supposed to be around 45-50psi on factory pump/ diesel fuel.

    Well I decided to change my filter today and install a fuel press gauge. I installed an autometer electric sender that I 't'd into the 3/8" line before it splits to the heads.

    Well I got it all wired up and turned the key and I have pressure, unfortunately it's 36psi according to the gauge. And when I rap the throttle it drops a couple psi.

    Havent even tried the veggie side yet as Im so freaked out and the truck is cold...Hoping that reads low too so it's a gauge issue not my diesel side or my injectors will be toast at that psi correct?

    FYI this is an old sender from my car so ??? or maybe there is air in the line? Maybe gauge is incorrect??? HELP!

    I have changed a few filters on this rig (like every 9-10k)so I don't think theres a issue there???
    2005 6.0l X
    V3 running 8/6/08
    40gal frame mounted tank

    Live by the grease, die by the grease

  • #2
    ok just ran it up to temp.. looks like 37psi idle


    switched to wvo and pegged the gauge lol 100+psi. I am hoping bad electrical sender. I did turn in the v3 press screw like 1 full turn from factory a few weeks ago..

    any thoughts?
    2005 6.0l X
    V3 running 8/6/08
    40gal frame mounted tank

    Live by the grease, die by the grease

    Comment


    • #3
      Err- I just realized what I did. When I put the new filter in for some reason I didn't push it on the cap first. I remember putting the filter in the housing and then putting the cover on.

      I'm sure that's it... now I gotta go outside in the cold. That's what I get for being in a hurry earlier.
      2005 6.0l X
      V3 running 8/6/08
      40gal frame mounted tank

      Live by the grease, die by the grease

      Comment


      • #4
        Glad you figures it out... Good news is you will probably never make that mistake again.

        Comment


        • #5
          Yeah, In fact I still don't know why I did it the first time...I guess I just rushed and didn't think it would matter.

          Anyway It now reads better, like 41-42psi at idle. Should still be higher from what i think i've read...



          Now I need to look into that AND dial down the veggie pressure some.
          2005 6.0l X
          V3 running 8/6/08
          40gal frame mounted tank

          Live by the grease, die by the grease

          Comment


          • #6
            Originally posted by Wilson View Post
            Now I need to look into that AND dial down the veggie pressure some.
            Yeah, 100+ psi is a lot!!

            However, I have found that the system seems to work better with the pressure set slightly higher than the stock DFA setting.

            Mine is right at 75psi now.
            Greasin & Grinin
            Vegi oil powered since Aug 08
            2006 F-250 PSD - CC, Lariat, 4X4 - Vegistroke converted 1/27/13!!
            2008 F-250 PSD - CC, Lariat, 4X4 - Sold
            2005 F-250 PSD - CC, Lariat, 4X4 - Sold

            Comment


            • #7
              Originally posted by Marv View Post
              Yeah, 100+ psi is a lot!!

              However, I have found that the system seems to work better with the pressure set slightly higher than the stock DFA setting.

              Mine is right at 75psi now.
              I think 75 psi IS the stock DFA setting. At least mine came that way (more like 78 psi).
              2005 F350 Harley: Heat Induction Hood, ARE Bed Cover, DashHawk, MBRP turbo back, cat delete, SCT: Tunes by Spartan, Exhaust Sound Videos HERE

              Comment


              • #8
                Originally posted by FastCote View Post
                I think 75 psi IS the stock DFA setting. At least mine came that way (more like 78 psi).
                You could very well be right. I know Jason told me two full turns back in (after taking it all the way out) which netted me right at 65psi. So, mine could have been off just a tad for some reason.

                Either way, with 2 1/4 turns (and 75 psi), the system does seem to work much better.

                With my luck, I probably just jinxed myself...LOL.
                Greasin & Grinin
                Vegi oil powered since Aug 08
                2006 F-250 PSD - CC, Lariat, 4X4 - Vegistroke converted 1/27/13!!
                2008 F-250 PSD - CC, Lariat, 4X4 - Sold
                2005 F-250 PSD - CC, Lariat, 4X4 - Sold

                Comment


                • #9
                  ok after driving it a couple miles it idles around 48-50psi on diesel... but under a load I still can see 35-40psi.

                  Is my diesel pump bad or what?

                  I know you guys have gauges!!!
                  2005 6.0l X
                  V3 running 8/6/08
                  40gal frame mounted tank

                  Live by the grease, die by the grease

                  Comment


                  • #10
                    Originally posted by Wilson View Post
                    ok after driving it a couple miles it idles around 48-50psi on diesel... but under a load I still can see 35-40psi.

                    Is my diesel pump bad or what?

                    I know you guys have gauges!!!
                    I think the consensus was that the diesel pump is a weak POS and you'll see pressure drop under load. On the WVO, I guess they aren't seeing as drastic of a drop.
                    Vegistrokin since 08/23/08

                    Comment


                    • #11
                      Originally posted by Jack_Toepfer View Post
                      I think the consensus was that the diesel pump is a weak POS and you'll see pressure drop under load. On the WVO, I guess they aren't seeing as drastic of a drop.
                      yep, i guess i am just alarmed now that i see whats going on hehe. I was just chugging along blindly without the gauge!
                      2005 6.0l X
                      V3 running 8/6/08
                      40gal frame mounted tank

                      Live by the grease, die by the grease

                      Comment


                      • #12
                        btw,
                        On WVO, during an hour trip I was able to get it down to about 50psi pulling a LONG(about 3mi) 25%+ grade... Long amount of time close to 3krpm

                        What do you guys see on WVO under large loads?

                        Stock calibration btw
                        2005 6.0l X
                        V3 running 8/6/08
                        40gal frame mounted tank

                        Live by the grease, die by the grease

                        Comment


                        • #13
                          Your pump will go out like a light bulb when it goes probably...your FPR probably needs tweeked.
                          I am not comfortable with anything below 53-55 psi (diesel) and on vegi my pressure never drops more than a few (5-6) lbs on WOT. I would have a dealer check stock pressure and when they see it that low, they will offer to take your money to change the FPR but its fairly easy to do yourself.
                          Adjust your vegi pressure up to 75 ish and you will be fine.

                          Comment


                          • #14
                            thanks clay... yeah I guess I'll have it looked at.

                            I think the large WVO pressure drop I am seeing is due to clogging donaldson filter. It's my first filter and about 3kmi so...?
                            2005 6.0l X
                            V3 running 8/6/08
                            40gal frame mounted tank

                            Live by the grease, die by the grease

                            Comment


                            • #15
                              Originally posted by CHenry View Post
                              I am not comfortable with anything below 53-55 psi (diesel)
                              I should have stated why...according to lots of diesel techs i have asked, low fuel pressure (below 45) will begin knocking out injectors. They need the pressure to keep the plunger inside them from "bouncing". If it bounces, it will destroy the internal seal and begine internally leaking fuel into your crank case through the valve cover area.

                              Comment

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